Merge pull 120 with code to access curses screen directly

[aki009]

Pull #120 with some changes to fork code to support use of curses screen directly. This supports apps that do major work outside of the usual event loop.

Moved mouse_enable to class NPSApp.init instead of run() function.

Added class NPSApp.init option to enable color.

Removed a bunch of curses init code in NPSApp that seemed to be managed elsewhere already.